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Fig. 3.39 shows the acceleration - time ...

Fig. 3.39 shows the acceleration - time graph for a particle in rectilinear motion. Find the average acceleration in first 20 s.

A

`40ms^(-2)`

B

`30ms^(-2)`

C

`20ms^(-2)`

D

`15ms^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
D
Average acceleration `=("Area of a-t graph")/("time")`
`=(Area OPQM)/(20)`
`= (1)/(2)(20+10)xx20xx(1)/(20)`
`=15 ms^(-2)`
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